Add crew cache option (#4763)

* Add option to cache downloads

* Add CREW_CACHE_DIR const

* fewer quotes

* Adjust cache dir location

* clean up spacing

* remove extraneous option

* add slashes to CREW_CACHE_DIR path

crew

@@ -497,15 +497,36 @@ def download
     sha256sum = @pkg.binary_sha256[@device[:architecture]]
   end
   Dir.chdir CREW_BREW_DIR do
+    unless ENV["CREW_CACHE_OPT"].to_s == ''
+      unless File.directory?(CREW_CACHE_DIR)
+        FileUtils.mkdir_p(CREW_CACHE_DIR) 
+      end
+      if File.file?("#{CREW_CACHE_DIR}#{filename}")
+        if Digest::SHA256.hexdigest( File.read("#{CREW_CACHE_DIR}#{filename}") ) == sha256sum then
+          FileUtils.cp "#{CREW_CACHE_DIR}#{filename}", "#{CREW_BREW_DIR}"
+          puts "Archive found in cache".lightgreen
+          return {source: source, filename: filename}
+          else
+          puts 'Cached archive checksum mismatch. :/ Will download.'.lightred
+        end
+      end
+    end
+
     if @opt_verbose then
       system('curl', '-v', '--retry', '3', '--progress-bar', '-C', '-', '--insecure', '-L', '-#', url, '-o', filename)
     else
       system('curl', '--retry', '3', '--progress-bar', '-C', '-', '--insecure', '-L', '-#', url, '-o', filename)
     end
+
     abort 'Checksum mismatch. :/ Try again.'.lightred unless
       Digest::SHA256.hexdigest( File.read("./#{filename}") ) == sha256sum
+    puts "Archive downloaded".lightgreen
+
+    unless ENV["CREW_CACHE_OPT"].to_s == ''
+      puts "Caching downloaded archive".lightgreen
+      FileUtils.cp filename, CREW_CACHE_DIR
+    end
   end
-  puts "Archive downloaded".lightgreen
   return {source: source, filename: filename}
 end
 

lib/const.rb

 # Defines common constants used in different parts of crew
 
-CREW_VERSION = '1.5.1'
+CREW_VERSION = '1.5.2'
 
 ARCH_ACTUAL = `uname -m`.strip
 # This helps with virtualized builds on aarch64 machines
@@ -16,9 +16,9 @@ else
   CREW_PREFIX = ENV['CREW_PREFIX']
   @pkg.build_from_source = true
 end
+
 CREW_LIB_PREFIX = CREW_PREFIX + '/' + ARCH_LIB
 CREW_MAN_PREFIX = CREW_PREFIX + '/share/man'
-
 CREW_LIB_PATH = CREW_PREFIX + '/lib/crew/'
 CREW_CONFIG_PATH = CREW_PREFIX + '/etc/crew/'
 CREW_BREW_DIR = CREW_PREFIX + '/tmp/crew/'
@@ -33,6 +33,12 @@ else
   HOME = CREW_PREFIX + ENV['HOME']
 end
 
+if ENV['CREW_CACHE_DIR'].to_s == ''
+  CREW_CACHE_DIR = HOME + '/.cache/crewcache/'
+else
+  CREW_CACHE_DIR = ENV['CREW_CACHE_DIR']
+end
+
 CREW_DEST_HOME = CREW_DEST_DIR + HOME
 
 # Set CREW_NPROC from environment variable or `nproc`